[bug#42021] [PATCH] Fix flatpak configure option

[Robin Templeton <robin@terpri.org>]

Currently, running an installed flatpak program (e.g. "flatpak run
com.github.micahflee.torbrowser-launcher") results in this error:

"bwrap: execvp xdg-dbus-proxy: No such file or directory"

Setting the full xdg-dbug-proxy path during configuration prevents this
error and allows flatpak programs to be run normally.

From 401c68d4d1581bc93eb67ff1f4feb21014dc513f Mon Sep 17 00:00:00 2001
From: Robin Templeton <robin@terpri.org>
Date: Tue, 23 Jun 2020 11:17:07 -0400
Subject: [PATCH] gnu: flatpak: Fix xdg-dbus-proxy configure flag.

* gnu/packages/package-management.scm (flatpak) [arguments]: Pass the full
"xdg-dbus-proxy" program path to the "--with-system-dbus-proxy" configure
flag.
---
 gnu/packages/package-management.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index 2cd7886011..44321240e9 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -1152,7 +1152,9 @@ the boot loader configuration.")
        (string-append "--with-system-bubblewrap="
                       (assoc-ref %build-inputs "bubblewrap")
                       "/bin/bwrap")
-       "--with-system-dbus-proxy")
+       (string-append "--with-system-dbus-proxy="
+                      (assoc-ref %build-inputs "xdg-dbus-proxy")
+                      "/bin/xdg-dbus-proxy"))
       #:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'fix-tests
-- 
2.26.2